The five friends are leading a happy life, maintaining the Greenet and the tree of life. But the peace doesn't last because of environmental pollution that cause the tree of life to wither. By the fault of Yoohoo and friend, the green seeds fly away to the Earth by accident. YooHoo and friends goes to the Earth to find the green seeds so that they can save the tree and the Greenet. They travel to many places on the Earth to collect each green seeds. On the journey, they get to help friends who are in need and they make many new friends.